SOURCE: microwave ovens
The Magnetron has failed, causing the waveguide to become damaged. If the waveguide is damaged/burned the microwave can not be repaired and should be replaced.
SOURCE: Microwave waveguide spatter shield burned through
THE PART IS CALLED A WAVEGUIDE COVER AVAILBALE FROM REPAIRCLINIC.COM
SOURCE: Sharp R-520LK is arcing.
Quite
often this is due to grease or food particles stuck somewhere in the
cavity of the oven or stuck on or behind the waveguide cover.
The metal
behind it should be cleaned with a mild, non-ammonia cleaner.
If the metal is chipped or charred, the area will first have to be sanded smooth and
cleaned and dried thoroughly.
Then you can apply some
high-temperature appliance paint, available from places like Wal-Mart,
Lowe's or Builder's Square.
If your waveguide cover
is burned or damaged, it will need to be replaced. It provides important
protection for the magnetron.
You can order Sharp parts from Encompass here or you can call them toll-free at 866-779-5835.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
SOURCE: My microwave just started to arc. Is the waveguide
No the wave guide is usually a porous material that almost looks like a light colored cardboard piece. Sound as if the stirrer plate is waht you are seeing. Make sure M/W is clean inside completly. Any build up of grease can cause this. Also make sure to check for chipped areas and if there are use an appliance touch up to cover the bare metal areas. A good cleaning will usually take care of the arcing tho.
If
the microwave is sparking or arcing the waveguide cover might be
damaged and shorting out. Try removing the waveguide cover and see
if the problem goes away. If there are any damaged spots in the
microwave ceiling or sidewalls, repair them and paint them with
microwave oven paint. Replace the waveguide cover if it is burnt or
if it will not stay in place.
If
the microwave is sparking or arcing on the side walls the paint
might have chipped causing pitting in the metal oven wall. Use
microwave safe paint to touch up any bare metal spots.
If
the microwave is sparking or arcing near one of the rack supports,
remove the support, repaint any bare metal, install a new support.
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